Definition of rain check noun from the Oxford Advanced Learner's Dictionary

 

rain check

 noun
noun
BrE
 
; NAmE
 
(especially North American English)
 
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  • a ticket that can be used later if a game, show, etc. is cancelled because of rain
  • Idioms
    take a rain check (on something)
     
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    (informal, especially North American English) to refuse an offer or invitation but say that you might accept it later ‘Are you coming for a drink?’ ‘Can I take a rain check?—I must get this finished tonight.’
    See the Oxford Advanced American Dictionary entry: rain check